Document Detail

Seasonal variation in haemodynamics and blood pressure-regulating hormones.
MedLine Citation:
PMID:  19776756     Owner:  NLM     Status:  MEDLINE    
Seasonal variation in blood pressure (BP) has been described in some people, although the variation is small for both systolic and diastolic BPs. The aim of this study was to elucidate underlying haemodynamic and hormonal mechanisms that may occur to defend seasonal changes in BP. Participants were 27 men and 7 women with either normal BP or early hypertension. Measurements of haemodynamics (cardiac output by dual-gas rebreathing) and hormones (resting catecholamines, renin activity, and aldosterone by radioenzymatic assay or radioimmunoassay) were performed during the summer, fall, winter, and spring seasons. Student's paired t-test with Bonferroni modification and regression analyses were used to examine the data with a significance level of P<0.05. Systolic and diastolic BP remained relatively constant across seasons. Cardiac output and stroke volume significantly decreased 10 and 15%, respectively, from summer to winter, whereas heart rate and systemic vascular resistance significantly increased 5 and 11%, respectively. Plasma aldosterone (PA) significantly increased 59% from summer to winter, whereas plasma norepinephrine (PNE), plasma epinephrine, and plasma renin activity (PRA) increased 19, 2, and 17%, respectively (pNS for each). Across the four seasons, mean arterial pressure significantly correlated with PRA and PA, whereas systemic vascular resistance significantly correlated with PNE and PRA. There are dramatic counterregulatory haemodynamic and hormonal adaptations to maintain a relatively constant BP. Norepinephrine, PRA, and aldosterone have a function in mediating the changes in haemodynamics.
K J Radke; J L Izzo
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-09-24
Journal Detail:
Title:  Journal of human hypertension     Volume:  24     ISSN:  1476-5527     ISO Abbreviation:  J Hum Hypertens     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-05-13     Completed Date:  2010-08-24     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8811625     Medline TA:  J Hum Hypertens     Country:  England    
Other Details:
Languages:  eng     Pagination:  410-6     Citation Subset:  IM    
Department of Medicine, Erie County Medical Center, 462 Grider Street, Buffalo, NY 14215, USA.
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MeSH Terms
Aldosterone / blood*
Blood Pressure / physiology*
Catecholamines / blood*
Heart Rate / physiology
Hemodynamics / physiology*
Longitudinal Studies
Middle Aged
Renin / blood*
Reg. No./Substance:
0/Catecholamines; 52-39-1/Aldosterone; EC

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